Multiplex communications – Fault recovery – Bypass an inoperative channel
Patent
1996-03-18
1999-11-02
Nguyen, Chau
Multiplex communications
Fault recovery
Bypass an inoperative channel
370228, 370243, 34082501, 340827, H04J 116, H04J 308
Patent
active
059783540
ABSTRACT:
Disclosed is an optical transmission system for transmitting data via an optical transmission line in accordance with a frame format having overhead which includes a K1 byte used for a switching request and a K2 byte used to respond to the K1 byte. The optical transmission system includes N sets of working terminal stations, one set of protection terminal stations, N-number of optical transmission lines for interconnecting respective ones of the N sets of working terminal stations one optical protection transmission line for interconnecting the one set of protection terminal stations, repeater stations, which are provided in the optical transmission lines between the N sets of working terminal stations, for demultiplexing and outputting data extracted from the transmission lines or for multiplexing data and inserting the data in the transmission lines, protection transmission line connecting units, which are provided at positions in a protection transmission line corresponding to positions at which the repeater stations are disposed, for switching a failed transmission line to the protection transmission line in every section demarcated by the repeater stations. A working terminal station or repeater station that has detected occurrence of failure in a transmission line of a prescribed section sends K1 byte to and receives K2 byte from an opposing working terminal station or repeater station of the section via a protection terminal station or protection transmission line connecting unit and switches the failed transmission line section to the protection transmission line.
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Iino Hatsumi
Ikawa Fumihiro
Moriyama Junichi
Naito Kanji
Taketomi Hisashi
Fujitsu Limited
Hyun Soon-Dong
Nguyen Chau
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